13531481 has 2 divisors, whose sum is σ = 13531482. Its totient is φ = 13531480.

The previous prime is 13531459. The next prime is 13531489. The reversal of 13531481 is 18413531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9709456 + 3822025 = 3116^2 + 1955^2 .

It is a cyclic number.

It is not a de Polignac number, because 13531481 - 2¹⁰ = 13530457 is a prime.

It is a super-2 number, since 2×13531481² = 366201956106722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13531481.

It is not a weakly prime, because it can be changed into another prime (13531489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6765740 + 6765741.

It is an arithmetic number, because the mean of its divisors is an integer number (6765741).

Almost surely, 2^13531481 is an apocalyptic number.

It is an amenable number.

13531481 is a deficient number, since it is larger than the sum of its proper divisors (1).

13531481 is an equidigital number, since it uses as much as digits as its factorization.

13531481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 26.

The square root of 13531481 is about 3678.5161410547. The cubic root of 13531481 is about 238.2950991965.

The spelling of 13531481 in words is "thirteen million, five hundred thirty-one thousand, four hundred eighty-one".